https://github.com/FrankBoesing/Minimal-SDR

Only one active component (MCP2036)
https://github.com/FrankBoesing/Minimal-SDR

audio sdr sdr-receiver teensy teensyduino

Last synced: 9 months ago
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Only one active component (MCP2036)

• Host: GitHub
• URL: https://github.com/FrankBoesing/Minimal-SDR
• Owner: FrankBoesing
• License: gpl-3.0
• Created: 2018-11-01T11:08:24.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2018-11-24T12:16:55.000Z (about 7 years ago)
• Last Synced: 2024-11-05T17:49:31.586Z (about 1 year ago)
• Topics: audio, sdr, sdr-receiver, teensy, teensyduino
• Language: C
• Homepage: https://bit.ly/2ETOuny
• Size: 3.91 MB
• Stars: 14
• Watchers: 5
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Minimal-SDR

[![Video](https://github.com/FrankBoesing/Minimal-SDR/blob/master/extras/1.png)](https://www.youtube.com/watch?v=VIKR3kuGEqg "First demo")

 Hardware:

 * MCP2036

   

  How does it work:

* Teensy produces LO RX frequency on BCLK (pin 9) or MCLK (pin 11) 

* MCP2036 mixes LO with RF coming from antenna --> direct conversion

* MCP amplifies and lowpass filters the IF signal 

* Teensy ADC samples incoming IF signal with sample rate == IF * 4

* Software Oscillators cos & sin are used to produce I & Q signals and simultaneously translate the I & Q signals to audio baseband

* I & Q are filtered by phase-added Hilbert FIR bandpass (for SSB) or FIR lowpass filters (AM) 

* Demodulation --> SSB, AM

* Decoding of time signals or other digital modes [tbd]

* IIR biquad filter to shape baseband audio

* Audio output through Teensy DAC